package com.sky.service.impl;

import com.alibaba.fastjson.JSONObject;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

@Service
public class UserServiceImpl implements UserService {

    private static final String WX_LOGIN = "https://api.weixin.qq.com/sns/jscode2session";

    @Autowired
    WeChatProperties weChatProperties;

    @Autowired
    UserMapper userMapper;

    @Override
    public User wxLogin(UserLoginDTO userLoginDTO) {
        String openId = getOpenid(userLoginDTO);

        // 判断openId是否为空，如果为空，登录失败，抛出异常
        if(openId == null || openId.equals("")) {
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }

        // 判断当前用户是否为新用户, 如果是新用户，自动完成注册
        User user = userMapper.findByOpenId(openId);

        if(user == null) {
            user = User.builder().openid(openId).createTime(LocalDateTime.now()).build();
            userMapper.insert(user);
        }

        // 返回用户对象
        return user;
    }

    // 使用微信接口服务， 获得当前微信用户openID
    private String getOpenid(UserLoginDTO userLoginDTO) {

        Map<String, String> params = new HashMap<String, String>();
        params.put("appid", weChatProperties.getAppid());
        params.put("secret", weChatProperties.getSecret());
        params.put("js_code", userLoginDTO.getCode());
        params.put("grant_type", "authorization_code");

        String response = HttpClientUtil.doGet(WX_LOGIN, params);

        JSONObject jsonObject = JSONObject.parseObject(response);
        String openId = jsonObject.getString("openid");
        return openId;
    }
}
